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Work on ATOMIC_VALUE_SET

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This commit is contained in:
John Hawthorn 2025-03-28 22:23:48 -07:00
parent 89199a47db
commit b28363a838
Notes: git 2025-04-18 04:04:11 +00:00 
Merged: https://github.com/ruby/ruby/pull/12921
1 changed files with 43 additions and 0 deletions
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43
include/ruby/atomic.h
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@ -315,6 +315,19 @@ typedef unsigned int rb_atomic_t;
#define RUBY_ATOMIC_PTR_CAS(var, oldval, newval) \
RBIMPL_CAST(rbimpl_atomic_ptr_cas((void **)&(var), (void *)(oldval), (void *)(newval)))
/**
* Identical to #RUBY_ATOMIC_SET, except it expects its arguments are
* ::VALUE. There are cases where ::rb_atomic_t is 32bit while ::VALUE is
* 64bit. This should be used for pointer related operations to support such
* platforms.
*
* @param var A variable of ::VALUE.
* @param val Value to set.
* @post `var` holds `val`.
*/
#define RUBY_ATOMIC_VALUE_SET(var, val) \
rbimpl_atomic_value_set(&(var), (val))
/**
* Identical to #RUBY_ATOMIC_EXCHANGE, except it expects its arguments are
* ::VALUE. There are cases where ::rb_atomic_t is 32bit while ::VALUE is
@ -730,6 +743,23 @@ rbimpl_atomic_size_exchange(volatile size_t *ptr, size_t val)
#endif
}
RBIMPL_ATTR_ARTIFICIAL()
RBIMPL_ATTR_NOALIAS()
RBIMPL_ATTR_NONNULL((1))
static inline void
rbimpl_atomic_size_set(volatile size_t *ptr, size_t val)
{
#if 0
#elif defined(HAVE_GCC_ATOMIC_BUILTINS)
__atomic_store_n(ptr, val, __ATOMIC_SEQ_CST);
#else
rbimpl_atomic_size_exchange(ptr, val);
#endif
}
RBIMPL_ATTR_ARTIFICIAL()
RBIMPL_ATTR_NOALIAS()
RBIMPL_ATTR_NONNULL((1))
@ -772,6 +802,19 @@ rbimpl_atomic_value_exchange(volatile VALUE *ptr, VALUE val)
return RBIMPL_CAST((VALUE)sret);
}
RBIMPL_ATTR_ARTIFICIAL()
RBIMPL_ATTR_NOALIAS()
RBIMPL_ATTR_NONNULL((1))
static inline void
rbimpl_atomic_value_set(volatile VALUE *ptr, VALUE val)
{
RBIMPL_STATIC_ASSERT(sizeof_value, sizeof *ptr == sizeof(size_t));
const size_t sval = RBIMPL_CAST((size_t)val);
volatile size_t *const sptr = RBIMPL_CAST((volatile size_t *)ptr);
rbimpl_atomic_size_set(sptr, sval);
}
RBIMPL_ATTR_ARTIFICIAL()
RBIMPL_ATTR_NOALIAS()
RBIMPL_ATTR_NONNULL((1))